<?php
/**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2018/3/30 0030
 * Time: 下午 5:00
 */
//区分大小写的常亮名
define("GREETING","欢迎Runoob.com");
echo GREETING;  //输出“欢迎访问Runoob.com”
echo '<br>';
echo greeting;  //输出“greeting”
echo '<br>';

//不区分大小写的常量名
define("TEST","欢迎访问Runoob.com",true);
echo test;  //输出"欢迎访问Runoob.com"
?>